<!DOCTYPE html>
<html>
<head>
    <title>{{ title }}</title>
    <style>
        body { font-family: Arial, sans-serif; max-width: 800px; margin: 0 auto; padding: 20px; }
        .container { text-align: center; margin-top: 50px; }
    </style>
</head>
<body>
    <div class="container">
        <h1>欢迎使用Flask应用</h1>
        <p>这是一个从0搭建的Flask框架示例</p>
    </div>
</body>
</html>